Threshing-cylinder-tooth lock.



0. C. SHAW.

THRESHING CYLINDER TOOTH LOCK.

, APPLICATION FILED OCT. 28, 1915.

1,179,666. Patented Apr. 18, 1916.

*rn PATENT a ORPHEUS C. SHAW, OF SPOKANE, WASHINGTON, ASSIGrNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO THE MODERN THRESHING CYLINDER COMPANY, INC.

THRESHING-CYLINDER-TOOTH LOCK.

Application filed October 28, 1915.

[0 all whom it may concern:

Be it known that I, ORrrInUs O. SHAW, a citizen of the United States, residing at Spokane, in the county of Spokane and State of lVashington, have invented certain new and useful Improvements in Threshing Cylinder-Tooth Locks, of which the follovw ing is a specification.

This invention relates to improvements in sectional cylinders for threshing'machines and has to do more particularly with an improved means for looking a tooth bar against rotation under working thrust from the cylinder.

My invention consists in providing the cylinder ends with a plurality of head receiving recesses which-are peripherally disposed in such a manner that the bars will be insertible and withclrawable peripherally of the cylinder. p

More particularly speaking, my invention relates to the novel formation of the recesses and in the provision of complementally formed heads whereby relative rotation of the heads with respect to the cylinder will be prevented under working thrust of the cylinder.

My improved recesses are continuously smooth and unbroken both circumferentially and transversely of their perimeters and they comprise releasing portions struck from relatively long radii centers and look ing portions struck from relatively short radii centers so that the locking action will be effected Wholly by cam action and there fore increasing working thrust from the cylinder 'will serve to more firmly anchor the tooth bars against rotative movement.

A special object of my invention is to provide a cylinder lock of this character which is of such configuration that the coacting parts may be cast to shape so that the cylin-' der can be assembled without machining either the recess or the bar head, this object beingpossible, in part, because of the omission of protuberant ribs 011' the bar head and corresponding cavities in the recess.

My invention will be more fully descrlbed in connection with the accompanying drawing and will be more particularly pointed out in and by the appended claims.

In the drawing: Figure 1 is a view in end elevation of a threshing cylinder showing the same equipped with the device of my invention. Fig. 2 is a view looking from Specification of Letters Patent.

Patented Apr. 18, 1916.

Serial No. 58,387.

the right of Fig. 1. Fig. 3 is an enlarged view in end elevation of one of the recesses and one of the bar heads illustrating the manner in which the head is inserted. Fig. 1 is a similar view showing the head inserted. Fig. 5 is a plan view of a tooth bar.

'Like. characters of reference designate similar parts throughout the different figures of the drawing.

As illustrated, 1 designates the cylinder ends and 2 designates the intermediate member. Tooth bars are designated at 3 and the same are provided with teeth 1' which project radially, or substantially so, from the periphery of the cylinder, when the bars are in' place. Because of the staggered relation of the teeth I provide an intermediate member 2 havingperipherally arranged offsets 5 whereby intermediate portions 6 may be locked thereto without interfering-with the'staggered relation or disposition of the teeth, as will be seen more particularly by reference to Fig. 2.

I will next describe the particular formation of the locking recesses in the cylinder ends and the'locking heads formed on the tooth bars and by reason of the fact that all are identical in construction and operation I will only describe one in detail and I will use the term cylinder end as applying either to the ends 1 or the intermediate memher 2 and I will consider that the description of the heads at the ends of the tooth bars will be the equivalent to the intermediate members formed between the ends ofthe bars. Generally speaking, the off-sets 5 have locking recesses 7 for receiving and retaining intermediate portions formed on the bars 3.

Now referring to Figs. 3 and't, it will be seen that the end 1 is provided with a recess extendingradially inwardly fromthe periphery 8, and intersecting the'latter. The recess is continuously smooth and unbroken both circumferentially and transversely of its perimeter. Said recess comprises a locking portion 9 which is struck from a center 10, and a releasing portion 11 which is struck from a center 12. The radius 13 is somewhat longer than the radius 14: but the locking portion 9 joins the releasing portion on a continuously curved line without any interruptions whatsoever. The tooth bar 3 is provided with a head 15 having a continuously smooth and unbroken periphery the recess and comprising a locking por shaped to correspond with the contour of tion 16, struck from a center17having a relatively short radius 18, and a releasing portion 19 struck from a center 20 and having a relatively long radius 21. When the head 15 is. disposed in the manner shown in full lines, in Fig. 3, it may be inserted into the recess and when it is rotated or turned as indicated in dotted lines, gradually toward the position shown in Fig. 4, the head will finally assume a position in which its entire periphery will be in'engagement with by the arrows in Figs. .1 and 4 and the workthe perimeter of the recess. Rotation of the cylinder will be in the direction indicated ing thrust will therefore tend to rotate the head 15 in the direction indicated by arrow X, rotation of the cylinder being indicated by arrow .Yand thruston the teeth being indicated by arrow Z. Therefore, thetlocking portions 9 and 16 will coact structurally, to prevent rotation of the tooth bar relatively to the cylinder under working thrust.

I have now described how rotation under working thrust is prevented and I will next describe the manner in which longitudinal displacement is prevented. As will be seen more particularly by reference to Fig. 5, the tooth bar 3 has a cross-section which is rectangular throughout the greater portion of its length and the heads 15 are formed on the bar at the ends of the latter, and like wise the intermediate'portion 6, so that shoulders 22 are formed at the ends, facing oppositely and intermediate shoulders 23. are formed facing toward each other;

der whatever stress is imposed byreversing the cylinder, said bars may be locked by a set screw or any desired mechanical expedient if necessary. However, the cam action of locking parts -9 and 16 is such that after the bars have once been subjected to working stress they will be so firmly anchored that rotary displacement under 'reversal will not occur. c v

\ It is believed that theadvantageS and utility of my invention will be fully understood from the foregoing description, and

while I have herein shown and described one specific form of my invention, I do not wish to be limited thereto except for such limitations as the claims may import.

I claim: 1

1. In combination, a threshing cylinder said tooth bar having a head provided with a continuously smooth periphery circumferentially and transversely. and saidhead being shaped to fit saidrecess and comprising a releasing portion struck from a relatively long radius center and a lockingiportion struck from a relatively short radius centerwhereby said bar will belocked against rotation 1n one direction when fitted in'said recess, substantially as described.

2. In combination,v a threshing cylinder portions provided with bar-receiving recesses, and tooth bars, having locking por tions formed at theirendsand between their ends for insertion into said receiving recesses, said locking portions being of differ ent cross-section with respect to the crosssection of the remainder of said bars thereby forming shoulders on said bars for, engagement -w1th said supporting portions to prehaving intermediate and end bar supporting cam locking recess and the. other of said members having a continuously smooth cam locking head complementally formed with respect to said recess to fittherein and pre-v vent relative rotative movement between said members, substantially as described.

In testimony whereof .I affix my signature. I

ORPHEUS o. SHAW;

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Y Y Washington, D. 0.. Y 

